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in reply to Re^2: Search and delete lines based on string matching
in thread Search and delete lines based on string matching

Here's an approach that initializes a hash of output tokens, prepopulated with marker text for new additions. The output data is overridden for existing entries, and a sorted list is appended to the specified output file (open with '>' instead of '>>' if you don't want this). Note that it isn't fully compatible with the delete code I posted earlier, since that code didn't take comments into account. 

#!/usr/local/bin/perl
use strict;
use warnings;

if (@ARGV != 3) {
    print "Usage: $0 <pattern file> <input file> <output file>\n";
    exit;
}

my ($pattern_filename, $source_filename, $dest_filename) = @ARGV;

open my $pattern_fh, '<', $pattern_filename or die "Failed to open $pa
+ttern_filename: $!";
my %output_tokens = ();
while (my $line = <$pattern_fh>) {
    chomp $line;
    $output_tokens{$line} = "$line # Added by script";
}

print "Expected tokens: ", join(', ', keys %output_tokens), "\n";

open my $infile, "<",  $source_filename or die "Failed to open $source
+_filename: $!";
open my $outfile,">>", $dest_filename   or die "Failed to open $dest_f
+ilename: $!";

while(my $line = <$infile>) {
    chomp $line;
    $output_tokens{$line} = $line;
}
for my $token (sort keys %output_tokens) {
    print $output_tokens{$token}, "\n";
}

close($infile);
close($outfile);

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Re^4: Search and delete lines based on string matching
by brut (Initiate) on Mar 13, 2007 at 15:26 UTC 
    
Hey

The very first code you provided me with is really working fine for no
+rmal strings without any non-alphabet characters except for its not w
+orking for strings which are like
A[0]
B[1]
So please resolve this .. I tried using the fix you gave but its not w
+orking.So need to modify the code for these cases of strings also.

Rest everything is really fine.
And real thanks for all the innovative solutions you have provided.You
+ really are excellent.

    [download]
[reply]
[d/l]
      It seems to work for me, unless I misunderstood your specs. Here are the files I am using:
      patterns.txt 
      A[0]
C
D

      [download]
      infile.txt 
      A[0]
B
C
D[0]
D1
DA

      [download]
      brut.pl 
      #!/usr/local/bin/perl
use strict;
use warnings;

if (@ARGV != 3) {
    print "Usage: $0 <pattern file> <input file> <output file>\n";
    exit;
}

my ($pattern_filename, $source_filename, $dest_filename) = @ARGV;

open my $pattern_fh, '<', $pattern_filename or die "Failed to open $pa
+ttern_filename: $!";
my @tokens = ();
while (my $line = <$pattern_fh>) {
    chomp $line;
    push @tokens, quotemeta($line);
}
my $pattern = '^(?:' . join('|', @tokens) . ')[^a-zA-Z]*$';
print "Search pattern: $pattern\n";

open my $infile, "<",  $source_filename or die "Failed to open $source
+_filename: $!";
open my $outfile,">>", $dest_filename   or die "Failed to open $dest_f
+ilename: $!";

while(my $line = <$infile>) {
    print "input : $line";
    if ($line =~ /$pattern/) {
        next;
    }
    print "output: $line";
    print $outfile $line;
}
close($infile);
close($outfile);

      [download]
      perl brut.pl patterns.txt infile.txt outfile.txt 
      Search pattern: ^(?:A\[0\]|C|D)[^a-zA-Z]*$
input : A[0]
input : B
output: B
input : C
input : D[0]
input : D1
input : DA
output: DA

      [download]
[reply]
[d/l]
[select]
        Yes it's fine except for the output should also have

D[0]
D1
DA

as I need exact matching i.e. only D in input will not delete D1 and D
+A from output.

And in the addition code, if I dont want the new outfile to be sorted.
+And it's a simple appending the strings whatever they be without any 
+string matching of file B with file A.

So in the addition requirement if A contains

B
C
F[0]

and B contains

D[0]
E

output should be 

D[0]
E
B
C
F[0]

        [download]
[reply]
[d/l]

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